(19)
(11) EP 1 156 618 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.09.2002 Bulletin 2002/36

(43) Date of publication A2:
21.11.2001 Bulletin 2001/47

(21) Application number: 01111915.3

(22) Date of filing: 17.05.2001
(51) International Patent Classification (IPC)7: H04L 9/00
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 17.05.2000 JP 2000145274

(71) Applicant: Yazaki Corporation
Minato-ku, Tokyo 108-0073 (JP)

(72) Inventors:
  • Ishihara, Tetsuya
    Susono-shi, Shizuoka-ken 410-1194 (JP)
  • Abe, Takahiro
    Susono-shi, Shizuoka-ken 410-1194 (JP)
  • Shono, Katsufusa
    Yokohama-shi, Kanagawa-ken 241-0005 (JP)

(74) Representative: HOFFMANN - EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Chaos cryptographic communication method and chaos cryptographic communication system


(57) Each of plural CPUs (13, 15, 17) enciphers a plaintext code which is a secrecy object according to chaos block encryption and then enciphers it according to chaos stream encryption. Then, it transmits an obtained cipher code through communication line (19). On the other hand, each of plural CPUs (13, 15, 17) that received the cipher code synchronously restores the received cipher code according to chaos stream encryption and then restores according to chaos block encryption thereby to obtain an original plaintext code.






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